The sound generated by a fast parton in the quark-gluon plasma is a crescendo

Details The sound generated by a fast parton in the quark-gluon plasma is a crescendo The sound generated by a fast parton in the quark-gluon plasma is a crescendo

2009-07-16

arxiv.org/abs/0907.2872v2

Nucl.Phys.A830:789c-792c,2009

Physics

Nuclear Physics

Nuclear Theory

4 pages, 2 figures. Proceedings for Quark Matter 2009, final version

Scientific paper

10.1016/j.nuclphysa.2009.10.072

The total energy deposited into the medium per unit length by a fast parton traversing a quark-gluon plasma is calculated. We take the medium excitation due to collisions to be given by the well known expression for the collisional drag force. The parton's radiative energy loss contributes to the energy deposition because each radiated gluon acts as an additional source of collisional energy loss in the medium. In our model, this leads to a length dependence on the differential energy loss due to the interactions of radiated gluons with the medium. The final result, which is a sum of the primary and the secondary contributions, is then treated as the coefficient of a local hydrodynamic source term. Results are presented for energy density wave induced by two fast, back-to-back partons created in an initial hard interaction.

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